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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8462ec083369fe458eecc5e38684646d172228d3a15dc11ae1af02959b33b0' 
  AND token = '1tI3J+Z6DevGW4SmQGBghNG6698kljTmHJcy/tiLjiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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