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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b897a97749acdae0ffc1ae970c50d3940126711bfdb3b34aded295a36f35631' 
  AND token = '0QvB2b8Ynjtm8pba0Ed0bfBiR2VfYHRDJLoJREV1lT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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