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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff7a1c45f7ffcc87c55f862a3206c69abffba89d1e42ed1e2c61eb7b2ad2432' 
  AND token = 'cy+CKGj41xOk/6MoqWOftQYEKcMjq1ds9QEeY6euyqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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