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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430c996f2d9c2444789f95fa760985c73694b07ece9e82314657a8831a8d55d7' 
  AND token = '3HoCGqNJbOtGFGBN1h7il5aVruVJUCa7AhQ0Hrgol4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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