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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfaccb96862ea968d2dcf4695278d5b566a3709077766eb1f009c4ddedf7c8bc' 
  AND token = '+4XhxfAONwcgbAqTD0i2HG1368NdgjvAPfgNX0qvu7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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