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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7674b65eacd730209e03955ace412a1eb6dad6a3c49d8f33178ef2287dd7eb' 
  AND token = 'EGdJkcDYN0Y7f5jSdJf8fyIedP91jElFfU/B3YA0JCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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