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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfaa251fe6900b9ac065c7dc97be1635123a3eaa4480aa24476b17d9c232dd6f' 
  AND token = '7mJLfAcRup/m4WASXSXL5NL/RRICqwgL7BZAMZRxLfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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