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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8708f61f331932b1534fb2865f02f22bb48de7ddb4eab8d3ad2685705b6f10' 
  AND token = 'g7dk4HV554sXoBy8psKjbD0iLkvHFK6Qskkt6qNSvEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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