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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd295a86eec81425bc289b4cf219e106e7bf6802db69d906f7c6619faf924a1' 
  AND token = '0dQGNJeIVAn5KqxoMROpx9Ey3xC8O/aq9K9675LRDOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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