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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e0abd5ff418384f7ab7039e819553216af33af54aa7ac919d6b0d09c2e6f6a' 
  AND token = 'kVnGOwn8Otnbx8DlPP3XqbR3B194d1UAq1/8TfjNrtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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