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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230ee1a4062ff58c4a4ec6da601b5996a03ccd71b5467c9e8a21eeae7c1600ff' 
  AND token = '6kdnB9dktRqc78jesJkeeRUtfTKqn2bAmOfHDtBsUYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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