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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f423d8a79c28e2818cf19ed97f1e11d0756fc17a4a352a0e0e54298b8a5b11c' 
  AND token = 'iISL7exyOyKU0TykqTJk9nV1OWrA6ilHXl/i6JcxZw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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