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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ff34df0690259063c165d813da655e65a1f1a8e2020235a895d10777197cad' 
  AND token = 'cwqxLufC+3AIHdFLq66+x+svD1XOicwLKa+QNgAQvB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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