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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1c09d18ae9aee404d2bf4d02852620bfd35c7093d92e3154184cd4a389d08e' 
  AND token = 'DdsBBlXovTp35+7UjEsVID+GAytO1CSgT5+i7TSnTEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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