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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a054fc623f19eaef0d020a18228912bc231412ee2601552e92321096a27ab719' 
  AND token = 'bEnU7TtuXWt41yf4aJe9+dQbUAZP9I5CJ+vcwOGcHLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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