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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49d795c865f6dfa5b54d4e062f2850c99ff9c43906416594f64f0832673cd03f' 
  AND token = '/czB5Rrl7RAtXJmXE22Wm76NBt4ri/ztCzTAnMS6jo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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