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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63dbe8ed09bbffb71ff4ba9b90eceb002796625b37c7904f2052e651df4e782' 
  AND token = 'At7vnrsTW6v6U51BcBn90psEH+cI1rAJOFt5m9T5aOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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