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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6268dc12134b46718818283d700a5aef43162936e0108f3cbaf933d44cb36c3' 
  AND token = 'E4OHWgt6Ok0EIF+L3tSt4P2j3OwAonIggNFzcLtUMdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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