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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de12ea63d468a285030905b3cf73ae666bd45a5e0b0dec8c683bd8c2a5384a4' 
  AND token = 'U68IIspU2axqGKJvw1UFlgdGr4+upfZhLd/PUpbGodY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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