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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73f01f8530fcada87cb3be444ecb71adf722b6896559c0f7f9c5c939dcb5c5b' 
  AND token = 'rSC5H16MR8J8HizYikEuDPL4PHWLC+rYJTHo61qBh8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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