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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a4fcd4f1365680793b0cb5c8fa7e7395bc3accf616f74fdb9b1ccca022052d' 
  AND token = 'PNm8QylA4WEf4nsSg9k6tz24slfwld8iWp7N58oDyNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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