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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada4e4844b97de62071e018cb6bfad42c417f4a39ff6e906ffd10c5f2f50e9b4' 
  AND token = 's5djfD6T8kIN97XVeqZAiWqXattRuYmIEIoIRkOZccA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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