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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e83da9e5960ff35b5f31bc93014ddf21ecef8d6ba2bf83a73b5c2be02d69cda' 
  AND token = '4EDGxkJeWolL5DSIihtTVF4xw0oIbrasGUyyRJC8fAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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