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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b55cb9768e00b4423f75cb6b9cabc854caa84aa201bf723824f714a97569714' 
  AND token = 'Wz71fn1EL/J3JssjADc7QB2AhLRuZmDDwCYwbjeJSf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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