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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b89b13230c0af6f38a6f57709ff32f02ba7e97815fec6aa5142a269d2869283' 
  AND token = 'nVzZYC/lUvkb0nwC9WV6ukirL0sHb4L5CLwOrIeMTjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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