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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d0eba10b29ce99a8e83b835355cce6334e1e25d5ef3dfc4d100493f9bb6e36' 
  AND token = 'x4DIcS3UFdcE8jWl1lPwfJN8/UIXMXEsnX13baqa2vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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