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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fb78e4cf76b8f5f8b57c8347b7611ce42f437e45aaa9a1cfcde7067c91bdc0' 
  AND token = '7VARW5DDUaynb89Boif2Ol0bUOqkN2PNgwdS1uMBve8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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