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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebfff0fc0e154d18e9f6779d98c8a2358a9e4ba8e53d2d83d9ebfdb55b9378e' 
  AND token = 'AYMnHFVULx8Lk7+ClMxSxzo5ue7rIyM4UYPAdwfuT00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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