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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b799bacd935c731669ea6aab6aba7ca550748530b1a13f6d4111d4967c191bf7' 
  AND token = 'AtYpoM0pvUr6oGHZM4tP9qMhChcRNWkLaB2ygKCPtgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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