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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba25adcff4c90a29503891f59ab3ea745ddb544f7c4b889a7339a1a45c0e1ac1' 
  AND token = 'L9JFQc1fAq2/oOA0xORvf8OnALU1m7gECDNMtqxKA64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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