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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecb14b7a25259af9d6fc0d14bf413b88f5bb794726322627a918cc9a6f6697b' 
  AND token = 'cxWrHI7V+SPRm23/VaNYS/E9p4iGxLQYhbPJ+aEgP9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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