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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acaaa8442862ce318429b68c6737bb6c5f9650447ce0bc46e4f082b00345025' 
  AND token = 'aIEokBox+iIzZLLUbYZy3EbLaMKEz1IppY4AW1IyhCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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