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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdb2bb8a164b4f44b8f5100cbf5726c7e2be0b5f68b472246fdc7934c243b10' 
  AND token = 'uxUfoSHhZ3zcYlgJTThgBN7HDGQOnb4J1avizh93O1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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