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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afd96ee0993b2463123a225a4072030b812c16524d71ed9c1f8eb9029af5a00' 
  AND token = 'vnrxPJzWgGTn6nU50rX1jvA7vEpxrXAmtvaCXC7zhcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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