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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badb93fbb24970af36aec17ea4f726de0b091a66efe61906a22f780ee826af61' 
  AND token = 'rxOdIlKuDEeojqM4bNYhv5aXlH6w52gjLhjogmz8AJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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