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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23575f57bd0d7ab713f8a01f223aa6eddc530b4bf583d3f47992af33e7933573' 
  AND token = '6HM9xIyUywMiRZt/sof5Mn/Edr2Ifv1bOoygoK06jTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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