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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d9e9dac153cb0d6a2e84a8c40a704617fa9ae759f35e99df6a61c8f4568caf' 
  AND token = '28bqBnXfNyYxoI58DhBttmaXhlczJwi9C2DWyhufEew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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