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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2e3cec6b76057f6cf660674ab673e7a4c5050c0372b2c5e7e862d0bdfc0f37' 
  AND token = 'iF6V9KoJ8zr1Lt6r3vBSCLqFXp5fwt5lP0ZrCJHuZAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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