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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9585e118d943116942746608c37101cef9f48adf1b3bfcd19ef7ef51ebd30dbe' 
  AND token = 'FyKJHt6I2Wp5jCO4gFNgy2MspxqoMe6C4TNdCitYGOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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