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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032a41e6cf1baa62a9d9d3c18a3509c218097b6b398da265d489979303e2becd' 
  AND token = 'bNSzHHx1dlKrDZh1IiqDiJMf2LUlN9BhvOEujcQPi18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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