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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94b8e6b699ac37783f7e56d28161eaf1f8fe6db970a8b5992faa6abdb04dddf' 
  AND token = '0tu7uDXWzbglPR5HN0n5mCTw04RfPGJ0BhuXQJTuZIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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