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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd372e6654cf60eea6da1f9bc2f5591fcc12a7cbe3855e07749a90f0eae5a2f' 
  AND token = 'bPtNnbT8Dmbhln14Jsnzz7qSn3OMwxXPeA9Z/CJrcHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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