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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4ebd8ffa1fdd286afd718f60cf2da9fe9fe8ecd24215cf0a55991ae7da1a97' 
  AND token = 'uoUwWEUS7hZdrELez29Veo1fScfs3m0AdQ6BGdzm9jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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