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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d7ebacac4f9c775d1c85011c574500d519a5f1fa6fd52ef5bceb00f9f47190' 
  AND token = '9JsVuzkUSP0Ao/f6T1vHU2hWHhFCbVDSLWdaz97vtJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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