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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f780bb318fb0469e92676947147321c6d3db7f9b42802512b7a7a700b6dd960' 
  AND token = '7VppAVYoMy83Voey8VmdtuR/mJ5XKqiY5gYQx+kZ9U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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