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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7cba87cf69113db1127c309504740a6e59deaaafcf33150f303728db7c652ab' 
  AND token = 'Q/UAYFxL6zpbcWCdyT9nhyLh6Gek3O6a5jc+4892x4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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