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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4cc95ec89ba7094c64f2d7deb7cb37852461645eef9a8a87af6da2e014ac20' 
  AND token = '0TQKzkTlPpAtOc1DGLwsrXyWR68BCmF8BP0BofLNpOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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