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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4fae1e34ebb9798ddcff688ecae342a79ad0896955cbf56e1eb28dce78b7a9' 
  AND token = '9vKnS/8djqXGRgYcO6n0P0QmpjvU17Hk6bhdzYwsXls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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