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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0fff9d96f993eccbcdc7fc7a1a69f5b62c9945f6a6acdf6b2f54802dd6ad32' 
  AND token = 'bEOIfUKWB07bK0kD7laWaxdKVSQ9P2aCR6g3wyA3h3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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