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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a07ab4edb54afd71b470dc99de6be1e64e52f30fc2b765367730b3ce7cf12cb' 
  AND token = 'pKAvwYB7LzTgmkosSbJhHpxozWYgwyQVA7arHZ1rFzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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