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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b34086747914d695ab6c70a2325cc7e9bb415bb60c89c7d95898dd09103e456' 
  AND token = 'H4HFbiTWd8GrycxuiFXayDXV4uVkSfMBWaQKGL7BRAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}