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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09ab2ba7bbc61cb247f3e1542fd283afc9ac09631ce85fc6cc8e62aab3cdc23' 
  AND token = 'WxTAfqKeOMpraLNd9bOtXQo/NtY6DfAmPdNHHNBIKs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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