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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d453942360dea69188bed8ab22f9cf269d3610e68aab8a2a7c3400cb68425b3' 
  AND token = '/3FZMt/aVzIe6F40AbQjQyNYWoDsvi2pgC19Z4el/DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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