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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85592e5f5d71b0e42799dcd898ee824ba4f20b4fe3285b3055baf45d62372688' 
  AND token = 'EVqFa58E3AT5vtgxuFDi8Ig5VeVhe+LPuGBwJN7kKtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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