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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8783b2b26f2f2e7cbcc9151f6e1b9e221b2eaaf0778d053ba0cf83d4ca605e9' 
  AND token = 'L5nhr0Qb8J6eGInMlJ+1P6iJ/y+zSlNpZy5IWPyebTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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