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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe616676327fe86444c66d9d41dd2c4a310587e80a09d2c04370bd383c62f85' 
  AND token = 'GyhwO6izgf9PusSmneMR43fQ0hpyQbvyysHkyNHzkfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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