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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f33a1bc971fa3a8824e1bb7688adf8e85edc95c17265e78a5b93b846c1b28fc' 
  AND token = 'STXgq8ZRYl79iOEFN8eMy3LTbCgjubLIT7zray26+ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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