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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deec78849fc69c1137e8a12adb8cd4d5a0984329417669a134a3623454caed86' 
  AND token = '3k914Z81XhPRI+D/99LoACkK4qAQL5Xn2g27Mw6lxXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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