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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6361e77885b468491c58622219847cb4c15d5501d7bc28c816d5fa0352ada7c1' 
  AND token = 'HuKJ6Qw5ecZH1Blu742mmGY33425bvdezJ4X+r9G0Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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