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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f49d8811d4c113ee5e69e6548b8b2aa9ad4e8998f37db649561b03a49f2df6' 
  AND token = '3MmNYkSLJj+49W7brqLvxCD5jYCnz+S19elbo5pD16w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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