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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd488da3654385fa2fc13ab0f6e71deb82e70cb9e059596597259ec49a171d7' 
  AND token = '1MRb1NsMec2/EIJdPo2Ca/rAqNvUP8ISTIEzqNg8xFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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