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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34926f52b392cffb86335fbf41f6bd5dcacc6290ae3df11d7bf92e79a30a3ad' 
  AND token = 'Jv+iXLULo5fexH9IXJtYhr00zhp0mY3vac3HZTpjDZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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