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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec7223ae382a710e21d4ecafd8c3aac15797fe6b41065abd3b3de25ca9e49c7' 
  AND token = 'SsjQILoxkMKPuBduHPRVcS4D5mE5feNb888TNiVbd7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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