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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99baf19e0a8186c054107955e2ed968ee085e4af260baf57894c3f700729e9f1' 
  AND token = '9XxZb8j4BptE96JFaqXTsvN+v52w19ZYWMah0ZEULoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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