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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87fa750f0a397b2accf7b76615d23a60c87a6d6297f8e11b2a1ee6e4040d562' 
  AND token = '2Xj6u6sCtKz74exvJWJlsU2Tsg59teleU4MZYIZYhq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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