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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca1a5479119b9e571d36a0923774d8ff947c559964d55c258ab9077f718f83c' 
  AND token = '9bHQx0EftQutBjFOc5rUQSqlAw7L4gr8M5yJq4Gikx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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