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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06044be7f1703fca1370bbe546ac31ed9862fbad32890abdae14ae9c39874db' 
  AND token = '2MtvsqYkYSW0o3glTZ1tl+LRtubD3Idx7Hxjg3cxnx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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