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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a5c49d3057d75c838d62617cc05da9729d80d84120da15a48cd9a623a365c1' 
  AND token = 'VrvpGnubJV2yDo1z8X+LiyK7dJd9R4hJiX7Gmutdzas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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