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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9e3849598e5c73a019d7eaacc01a058b11d9a395778d22057cfb8d025ee8b3' 
  AND token = 'gw7cnSqAweYP+o6Pn/HQhhrZ+KZEeOYHfjnuqfYEH0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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