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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c194843f3d6b90d7df8ace6236240f0c97562e059f2b4c20c7a5e8c7078f5d5' 
  AND token = 'x56FH0Rs6Xb3HiLYAJFQJO5O8T2FwIcFCWG/L1fE0Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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